Reverse Clutch Applies
WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
Manual Valve
Mechanically controlled by the range selector lever, the manual valve is in the Park (P) position and prevents drive\reverse regulator (19) fluid pressure from the clutch regulator valve from entering the drive (18) and reverse (22) fluid circuits.
#4 Ball Check Valve
The #4 ball check valve remains unseated and routes reverse (22) fluid thru orifice #43 and #44 to the reverse clutch.
Reverse Clutch Assembly
Reverse (22) fluid is routed to the reverse clutch piston to apply the reverse clutch plates.